Mushrooms · Medium

How to Grow Button Mushroom

The world's most popular mushroom, and trickier than it looks. Button mushrooms need a specific composted manure substrate and a casing layer of peat moss. Rewarding once you get the setup right.

medium grown indoors — any zone
Days to first harvest
14–21 days
Light
No light needed
Humidity / Water
Mist daily — keep casing moist
Substrate
Composted manure substrate with casing layer
pH
6.5–7.5

Growing Cycle

Runs on a repeating 3-month cycle — start any time of year.

Jan
Plant
Feb
Growing
Mar
Harvest
Apr
Plant
May
Growing
Jun
Harvest
Jul
Plant
Aug
Growing
Sep
Harvest
Oct
Plant
Nov
Growing
Dec
Harvest
Plant Growing Harvest

Feeding Schedule

How often
none needed
Feed type
none
Key timing
n/a

Buttons require a pre-composted manure substrate — this provides all nutrition. The casing layer (peat moss + lime) triggers pinning. No additional feeding.

Succession Growing

Start new batch every 3 weeks

Prepare new trays every 3 weeks. Each tray produces 3–4 flushes over 6–8 weeks before exhaustion. Staggered trays give you continuous harvests.

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Common questions

Composted horse manure is the traditional substrate. It must be fully composted (not fresh) and properly pasteurised. A casing layer of peat moss mixed with lime is applied on top to trigger pinning.
The most common cause is skipping or incorrectly applying the casing layer. Button mushrooms won't pin on bare compost — the casing layer of peat and lime is essential to trigger fruiting.
Typically 3–4 flushes over 6–8 weeks, with yields declining each time. The first two flushes are usually the most productive.

Free app · iOS February 2028

Track your Button Mushroom in plant

Get reminders for inoculation, fruiting, and harvest windows.

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